Electric incandescent lamp



Dec. 25, 1928. 1,696,594

P. o. CARTUN ELECTRIC INGANDESCENT LAMP Filed June-9, 1925 Fig.3

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HIS .ATTDRZVEYT- Patented Dec. 25, 1928.

UNITED STATES PATENT- OFFICE. A

PAUL OQGARTUN. OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC INCANDESCENT LAMP.

Application filed June 9,

My invention relates to electric incandescent lamps, and more particularly 'to improvements in the mounting and arrangement of the filaments in certain types of lamps comprisingan elongated bulb, and generally known as show case lamps.

The object of my invention is to provide an improved electric incandescent lamp which is highly efficient and which has an unusually long life due principally to the absence of the great number of supports which are typical of lamps of this character now in use. My improved filament mounting is comparatively simple, yet rugged in construction so as to withstand shocks without injury.

For a better understanding of my lnvention, reference may be had to the accompanying drawing in which Fig. 1 is an elevation of an electric incandescent lamp comprising my invention; Fig. 2 is a sectional plan view along the line 22 of Fig. 1; Fig. 3 is an elevation of an electric incandescent lamp comprising a modification of Fig. 1; Fig. 4 is a i sectional plan view along the line 4;4 of Fig.

3; and Fig. 5is a fragmentary perspective of the modification shown in Fig. 3.

Referring to the drawings, 10 is'a glass bulb tubular-in form which comprises a base 11 and a stem 12. Into the latter are sealed the leading-in wires 13, 14, which are electrically connected to the conductors 15, 16, usually of copper or nickel. A glass supporting rod or arbor 17 is united to the stem 12 and has formed thereon the buttons 18, 19, which have embedded therein the horizontally disposed supports 20, 21. As shown in Figs. 1 and 2, the upper supports 20 are placed at rightangles with respect to the lowor supports 21. The lower button 19 has embedded therein a substantially vertical support 22. The supports 20, 21 and 22, ordinarily of metal Wire such as tungsten or molybdenum, are very flexible so as to resiliently support the filament 23. The filament 23, preferably of tungsten, is of the closely coiled concentrated form. The draping of the filamentis accomplished by clamping one end thereof to the conductor 15, then carrying it in the direction of the arrows (Fig. 1) through the various loops formed on the end 1925. Serial No. 36,053.

of each support wire, the other end of the filament finally reaching the conductor 16 where it is clamped. As shown in Fig. 2, when viewing the lamp from its stem end, thelfilament appears to outline a quadrilatera v The construction shown in Figs. 3, 4: and 5 may be used to advantage in low voltage lamps Where the length of filament required is much shorter than is required in lamps of higher voltage such as shown in Figs. 1 and 2. The filament 24 afterbeing clamped to the conductor 15, asshown in Fig. 5, 1s draped over the horizontal support Wires 25 and vertical support wire 26 and is held in position by means of loops formed on the outer ends of the said support Wires. The other end of the filament is clamped to the conductor 16.

What I claim as new and desire to secure by Letters Patent is '1. In an electric incandescent lamp comprising a base and a bulb, the combination of a stem sealed into said bulb at the base end thereof, a rod extending longitudinally of said bulb and united to the said stem, a pair of leading-in wires extending through said stem and having their ends located adjacent to the junction between said stem and rod, "a pair of support wires extending in opposite irections from said rod at an intermediate point thereof and in a plane substantially normal to that of said leading-in wires, another support wire extending from the end of said rod longitudinally thereof, and a filament draped so as to have. substantially straight portions extending from each of the ends of said leading-in wires through the ends .of the first-mentioned support wires,

and having a portion also engaged by said longitudinally extending support wire.

2. In an electric incandescent lamp comprising a base and a bulb, the combination of a stem sealed into said bulb at the base end. thereof, a rod extending longitudinally of said bulb and united to the said stem, a pair of leading-in wires extending through said stem and having their ends located adjacent to the junction between said stem and rod, a pair of support wires extending in opposite directions from said rod at an intermediate point thereof and in a plane substantially normal to that of said leading-in Wires, an-

other pair of wires extending from said rod in a plane substantially parallel with that of said leading-in Wires, and a filament draped so as to have substantially straight portions extending from each of the ends of said leading-in Wires through the ends of the PAUL O. CARTUN. 

